I recently discovered the Ancient Ruins in route 120 (near Lilycove City) but I have no idea how to open the entrance to it, there is one big rock (claimed to contain the Ruins) in the middle of six large boulders, I walked around it and found a hidden kecleon (male-lv30) at the back of it, I caught it, (just incase it's needed) and now I don't know what to do! I tried using secret power, strength, and rock smash, but they didn't work, does anybody know how to open the entrance to the Ruins?

I just caught Relicanth! I didn't realise how easy it was! As soon as I went into the seaweed and made a few encounters with Clamperl, he appeared, just like that! I know some people who have spent a long time trying to find it!